Mathematics
A hemi-spherical bowl (as shown) has external radius R and internal radius r, the outer surface area of the bowl is :
2πR2 + πr2
3πR2 - πr2
2πR2 + 2πr2
2πR2 - πr2

Related Questions
The volume of a conical tent is 1232 m3 and the area of the base floor is 154 m2. Calculate the :
(i) radius of the floor,
(ii) height of the tent,
(iii) length of the canvas required to cover this conical tent if its width is 2 m.
A solid metallic sphere of radius 16 cm is melted to form small identical spheres each of diameter 4 cm. The number of spheres formed is :
64
252
512
1024
The ratio between the volumes of two spherical solids is 27 : 8. The ratio between their curved surface areas is :
27 : 8
8 : 27
3 : 2
9 : 4
A solid metallic sphere of radius 8 cm is melted and recast into 64 identical solid spheres. The diameter of each smaller sphere formed is :
4 cm
2 cm
8 cm
1 cm